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A polygonal cross-section is an arbitrary closed polygon. It is clear that individual segments (edges) of the polygon MUST NOT intersect each other. On the other hand, if the final cross-section consists of several partial sections, these may intersect or overlap - see Rules for general cross-sections.
The individual segments of the polygon may be (i) linear or (ii) circular.
It is possible to adjust the following parameters for the polygonal section.
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Name |
Specifies the name of the polygonal. It is used for easier orientation especially if the final cross-section consists of a larger number of partial sections. |
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Type |
This parameter cannot be changed and indicates the type of the partial section. |
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Material |
See chapter Properties of the partial cross-section. |
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Corrosion |
See chapter Properties of the partial cross-section. |
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Phase |
See chapter Properties of the partial cross-section. |
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Overlap |
See chapter Properties of the partial cross-section. |
A polygon may also be used to create an opening in another polygonal cross-section. The only requirement is that the opening intersects or lies inside the other partial section that may be either of polygonal or thin-walled type. The intersection of two regions is deducted from the non-opening shape. A few examples follow.
The smaller polygon (with one circular edge) is fully inside the rectangular polygon. The result is a cross-section of rectangular outline with an opening.
The two triangular openings just overlap the solid square.
The result is an irregular hexagonal cross-section.
